User account A1 can create tables under the schema called EXAMPLE.
Suppose that A1 creates the two base relations EMPLOYEE and DEPARTMENT
A1 is then owner of these two relations and hence all the relation privileges on each of them.
Suppose that A1 wants to grant A2 the privilege to insert and delete tuples in both of these relations, but A1 does not want A2 to be able to propagate these privileges to additional accounts:
GRANT INSERT, DELETE ON
EMPLOYEE, DEPARTMENT TO A2;